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Be aware how your voice works. Have you ever pulled the open end of an air filled balloon tight and the air rushes out at a squeal like pitch, then the more you open the balloon, the quieter and lower the pitch gets. This is a literal representation of your vocal chords.
1 Ectasias are dilated or abnormal blood vessels under the surface of the vocal cord that can bleed and cause vocal fold stiffness.  Vocal cord sulcus, scarring of the vocal cord with an indentation along the inner edge of the vocal cord, can lead to reduction in vocal cord vibration.